An alternate is defined as a person who takes the place of another.
An actor who takes the place of another actor in scenes requiring special skills or preparations:
A backup copy of data, a file, etc.
(Statistics) The act of returning each item that has been selected in a subset from a group before making another selection.
A person or thing ready to serve or be put into service on an emergency basis or as a substitute
Find another word for understudy. In this page you can discover 7 synonyms, antonyms, idiomatic expressions, and related words for understudy, like: alternate, double, stand-in, substitute, backup, replacement and standby.